W90N745CD Datasheet, PDF (319/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
6.13 General-Purpose Input/Output
The General-Purpose Input/Output (GPIO) module possesses 31 pins and serves multiple function
purposes. Each port can be configured by software to meet various system configurations and design
requirements. Software must configure each pin before starting the main program. If a pin is not used for
multiplexed functions, the pin can be configured as I/O port
Two extended interrupts nIRQ2 (GPIO0 pin) and nIRQ3 (nWAIT pin) are used the same interrupt request
(channel #31) of AIC. It can be programmed as low/high sensitive or positive/negative edge triggered.
When interrupt #31 assert in AIC, software can poll XISTATUS status register to identify which interrupt
occur.
These 31 IO pins are divided into 7 groups according to its peripheral interface definition.
y Port0: 5-pin input/output port
y Port1: 2-pin input/output port
y Port2: 10-pin input/output port
y Port3: Reserved
y Port4: 1-pin input/output port
y Port5: 13-pin input/output port
need updated
y Port6: Reserved
PORT0
0
1
2
GPIO0
GPIO1
GPIO2
3
GPIO3
4
PORT1
0
1
PORT2
0
1
2
3
GPIO4
GPIO18
GPIO19
GPIO20
GPIO21
GPIO22
GPIO23
Table 6.13.1 GPIO multiplexed functions table
Configurable Pin Functions
AC97_nRESET
(I²S_MCLK)
nIRQ2
AC97_DATAI (I²S_DATAI) PWM0
AC97_DATAO
(I²S_DATAO)
PWM1
AC97_SYNC
(I²S_LRCLK)
PWM2
AC97_BITCLK
(I²S_BITCLK)
PWM3
Configuration Pin Functions
-
nXDACK
-
nXDREQ
Configuration Pin Functions
PHY_RXERR
KPCOL0
PHY_CRSDV
KPCOL1
PHY_RXD[0]
KPCOL2
PHY_RXD[1]
KPCOL3
USBPWREN
DTR3
DSR3
TXD3
RXD3
-
-
-
-
-
-
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